TL;DR It’s an interesting, tongue-in-cheek sci-fi that gets funnier and philosophical in the latter third of the book.
Let me start by saying I am not a sci-fi fan. A friend once lent me all of her Dune books but I never got past the first few chapters. I have not even watched any of the Star Wars movies in full. You may kill me now, sure.
That said, getting into Douglas Adams’ The Hitchhiker’s Guide to the Galaxy was a bit of a struggle for me. The only reason I decided to read it was so I could get the deal about the towel reference — something about the towel being “the most massively useful thing an interstellar hitchhiker can have.” That factoid didn’t really do anything to forward the narrative. It’s just that: a factoid in the Hitchhiker universe.